Pro-Tec JR. Classic FIT Certified Helmet. Pro-Tec took the Classic and fitted our Twist Fit System – a dual directional ratcheting adjustment dial. They added a magnetic Fid-Lock buckle to eliminate those pesky neck pinches and for ease of use with little fingers, then miniaturised it for the youngest of rippers. The Twist Fit system is perfect to help dial in the fit, allowing you to make small adjustments as required and to allow the Helmet to grow with you little ripper as they do.